NY -- Standard & Poor's CreditWire 12/21/95 -- Standard & Poor's affirms its triple-`B'-plus rating of Talisman Energy Inc.'s US$175 million senior unsecured debt following the offer by Talisman to purchase 100% of the outstanding shares of Goal Petroleum PLC for approximately C$275 million, plus existing debt of C$40 million. Goal is a U.K.-based exploration and production company with total proven and probable reserves of 45 million boe and daily production of around 20,000 boe per day, predominantly oil. At June 30, 1995, Goal had net assets of about UK98 million (C$206 million) and pretax profit of UK7 million (C$14 million). The board of directors of Goal has approved of the offer, and Talisman has firm commitments from 29% of